Sound has been used for centuries to study wildlife. From identification of birds through birdsong to utilising state-of-the-art sound recorders. Animals transmit information about themselves to the environment using sound and this information can be used by researchers to survey ecological populations and animal behaviour. Acoustic monitoring uses acoustic sensors to do this and over time the hardware has become progressively smaller, more sensitive, and cheaper. Additionally, new technologies mean that rather than trawling through hours and hours of sound recordings, technology can extract useful information. It offers a non-invasive way of monitoring endangered species, understanding habitat use, and identifying sounds of illegal activities such as gunshots and chainsaw noise. Common species that acoustic monitoring is used for include dolphins, whales, and bats.
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